Harmer denney



H. DENNEY.

TUBE.

(No Model.)

No. 444,233. Patented Jan. 6,l 1891. f

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W/TNESSES:

UNITED STATES PATENT OEEICE.

HARMER DENNEY, OF BROOKLYN, NEW YORK.

` TUBE.

SPECIFICATION forming part of Letters Patent No. 444,233, dated January6, 1891.

Application tiled October 17,1890.

.To @ZZ whom it' may concern:

Be it known that I, HARMER DENNEY` a citizen of the United States, and aresident of Brooklyn, in the county Kings, State of New York, haveinvented certain new and useful Improvements in Tubes, ot` which thefollowing is a specification.

This invention relates to an improved tube made of paper, and which isto be treated with material rendering it tire and water proof, or to betreated In any other suitable manner.

The invention consists ot' a papertube composed ot' a core formed of astrip of paper wound spirally with a great pitch, and on said core areapplied two successive coverings or layers, also formed of paper stripswound spil-ally, but with much less pitch than the core, the spiralforming the core ruiming in one direction and the spiral of thecoverings running in ihe opposite direction.

In the accompanying drawings, Figure 1 is a view of a piece of myimproved tube, parts of the two covering-layers being removed. Fig. 2 isa cross-sectional view on the line 2 2, Fig. l.

Similar letters of reference indicate corresponding parts.

The core Aof the tube is 'formed of astrip c of paper, which iswoundspirally on a suitable mandrel or analogous device, so as to havevery great pitch. Upon said spirally- Wound core two covering-layers Band O are formed successively, said covering-layers B and O being eachformed of strips b and c, respectively, both Wound spirally in the sainedirection,the direction in which the said covering-strips b and c arewound being the reverse of the direction in which the core-strip a iswound. The stripsb and c are provided with paste or cement before beingwound upon the core, so as to firmly adhere to the same and to eachother. By forming the core of the spirally-Wound strip the rigidity ofSerial No. 368,461. (No model.)

the same is materially increased and itsV strength is made uniform, forthe reason that the seam of the core runs spirallyin the same incontradistinction to paper tubes made heretofore in which the core wasmade by bending a strip of paper transversely to form a tube having alongitudinal seam. A core having a longitudinal seam is always Weakestalong the longitudinal line of the seam, and, fu rlhermore, it is verydifficult to form a tube the cross-section ot which is a perfectly-truecircle, provided the tube has a longitudinal seam. By making the core ofa spirally-wound strip the cross-section of all parts of the core willbe a perfectand true circle, and each part of said core will be able toresist pressure equally and uniformly. By making the core with a longspiral-that is, a spiral of great pitch-the strength and rigidity of thetube are increased, as the long spiral presents greater resistanceagainst bending or shearing strains. and the short-er spirals of thecovering-layers securely bend and hold together the long spirals of thecore Having thus described my invention, I claim as new and desire tosecure by Letters Patent- A tube composed oi a core formed of a pa;

per strip wound spirally with great pitch and one or morecovering-layers formed of paper strips Wound spirally with less pitch onthe spirally-Wound core, the direction of the winding of thecovering-layers being the reverse of the direction of the winding of thecore, substantially as set forth.

In testimony that I claim the foregoing as my invention I have signed myname in presence of two subscribing witnesses.

HARMER DENN EY.

Witnesses:

OscAE F. GUNZ, MARTIN PETRY.

